Furnace structure



FURNACE STRUCTURE Filed'Nov. 20, 1926 2 Sheets-Sheet 1 Y.. fil l A N :i E E l if E l N E I n 30.5 N E E INVENTOR H. B. GRONINGER FURNACE STRUCTURE June 5, 1928.

4Filed Nov.v 2o, 192e 2 sheets-sheet 2 R O T N E V m vf, Lft

l furnace construction.

Patented June 5, 192e.

UNITED STATES ina'ralv'rl OFFICE.

HOLMES IB. GRONINGER, OF BORT ROYAL, PENNSYLVANIA. i

FURNACE STRUCTURE.

Application led November 20, 1926. Serial No. 149,668.

usually been made of silica brick, while in basic steel furnaces the hearth has been made of a basicmaterial, usually magnesite bricks covered by a lining of magnesite. i Not only do the silica bricks in the walls and roof gradually Wear or burn away under the high temperature to which they are exposed, but the silica melts and fuses with the iron oxid which is formed during the operation of the furnace, forming a silicate of iron, or slag, which attacks the basic hearth. A lbasic substance suitable t o be formed into refractory bricks -and tiles, such as magnesite, cannot lbe economically used for forming the roof and walls of the furnace, for the reason that the magnesite is friable and crumbles and spalls away under the high temperature.

In order to render possible the use of basic material, such as magnesite, there has been shown and described in United States Letters Patent No. 1,106,725, a furnace wall construction composed essentially of cylindrical containers of iron or steel into which magnesite and other basic or neutral materials `are tamped, forming a non-acidic core in the container. These cylindrical composite structures are then employed to form the walls of the furnace.

It is the object of the present' invention to improve upon the last named construction,

' and, briefly stated, it consists in providing a thin envelope of iron or steel to be slipped upon standard forms of manufactured bricks and tiles composed essentially of basic o1' neutral material, and particularly inagnesite. The envelope may take a variety of forms, depending upon the shape of lthe brick or tile, of which there are many shapes made and commercially used in The envelope should be open on one end or on one side, as the case may be, in order to be slipped upon the molded tile.

In the accompanying drawings Figure 1 is a sectional elevation of a portion of a basic open-hearth steel furnace constructed in part of furnace bricks and tiles embodying the present invention. Figure 2 is a perspective view of a common form of commercial tile which is used in steel furnaces. Figure 3 shows in perspective a suitable metallic envelope for the tile of Figure 2.

Figure 4 is a view in cross-section of the composite tile.

Referring `to Figure 1, the melting chamber o-f the furnace is indicated by the nu- -mcial 1, and the basic hearth by the nu- -meral 2.

The gas flows from thevregenerators designated by the numeral 3, through the conduit 4 and the port 5, and the air from the regenerators 6, through the conduit 7 and the port 8, the ports 5 and 8 being divided in the usual way by a bridge or arch 9.

Those portions of #the furnace structure which are exposed to very high temperature,

as for instance the side Walls and roof and the masonry structure in and about the gas and air ports are, so far as desired, constructed of the composite bricks and tiles herein shown` and described, as generally indicated in thedrawings by the numeral 10.

'The invention is particularly applicable for use in basic open-hearthiand electrical furnacesQA The metallic envelope holds the premolded brick or tile from disintegration, and as the maximum temperature of the furnace is reached, the metal in the envelopes included in the Wall melts and fuses with the metal in adjacent envelopes andwith the premolded tiles as well, and the Wall or roof structure is integrated. 'No mortar need be used in building-the walls and roof of thev furnaces, and the result is a very durable and unitary structure.

I claim as my invention: r

1. A composite brick or tile for use in steel furnaces comprising a premolded block of non-acidic material contained in a metallic sheath or envelope.`

2. A basic steelfurnace including in its structure a built-up body of composite bricks or tiles, each comprising a premolded block of ,non-acidic material and a metallic sheath,

.saidbody having been integrated under the high temperature of the furnace.

3. A casing for a furnace brick adapted to be laid with other encased brick `in thev building of a masonry structure, said easing being open on one side and by virtue of'such open side adapted to receive 'a yfilling. body, said open side s0 arranged as togbefclosed in the built structure by the'ucasing of adjacent bricks.

.In testimony whereof I have hereunto set my hand.

HOLMES n'. enonmenn. 

